I like knowing, but then I like working with small starting gene pools (ie, I'll probably only buy around 6 of a plant and made sure they are very diverse and then only add a new plant or two if I'm missing a trait) so a lot of checking the history of things (and whether they've had a lot of offspring or not...it becomes important if you are working with some plants like roses due to fertility issues and poor germination). I have an odd approach, but I'm doing it for my own self interest than anything else.
Having said that, if I were to ever introduce something it'd be sdlg x sdlg because I honestly have no idea...I could tell you every cultivar or species in the gene pool I'm working with and that the specimen is a product of heavily selecting for a list of traits. But chances are I will have mixed pollen from a few plants with similar traits, collected pods from similar mother plants and lumped the seed together in loosely defined groups (I need to know roughly what I'm expecting improvements on so I can cull!) and be over 5 generations from those initial cultivars and be loosely in the area of having created a strain than a unique cultivar as such.
TLDR. If you're very interested in the plant, I'd ask the breeder if possible. They may not be conventional in their approach but they may have a lot of info about the cultivar and it's genetic history that just doesn't fit in the singular template that the industry created. If they can't/won't tell you anything though then they are probably being intentionally secretive and as you said you may not want to encourage that by purchasing.
